color match between fiber-reinforced composite (frc) restorations and teeth is an imperative factor in esthetic dentistry. the purpose of this study is to evaluate the influence of veneering composites and fibers on the color change of frc restorations.glass and polyethylene fibers were used to reinforce a direct microhybrid composite (z250, 3m espe) and a microfilled composite (gradia indirect...

the aim of this study was to determine the effects of 40% hydrogen peroxide and 15% carbamide peroxide on microhardness and color change of a silorane-based composite resin in comparison with two methacrylate-based composites.fifty-four disc-shaped specimens (a3 shade) were fabricated of filtek p90 (p90), filtek z350xt enamel (z350) and filtek z250 (z250) (3mespe) (n=18). the samples of each co...

Objective: The objective of this study was to investigate the effects liquid coloring in different dipping times and finishing procedures on color difference precolored liquid-colored monolithic zirconia ceramics. Materials Methods: 240 specimens were divided according shades (A1, A2, A3), time (3, 5, 7 minutes), surface (glaze mechanical polishing) (n=10). CIE L*, a*, b* values measured differ...

This work aimed to develop and characterize edible films made with cassava starch buriti oil in a factorial scheme verify the effect of interaction between these factors on physical properties. The experiment was developed an entirely randomized design 2 × 3 scheme. They were prepared six different formulations evaluating thickness, water solubility, moisture, activity, chromaticiy (C*), total ...

throughout the present research, squash (cucurbita pepo) slices (0.4 cm thickness and 4 cm diameter) were blanched in a steam chamber for 4 min. following cooling to room temperature, the squash slices were dehydrated by use of a hotair dryer, under air temperature of 60°c up to moisture content of 0.1065 kg h2o per kg d.m. squash slices of specified weights were rehydrated by immersion in dist...

In this paper, the optimal design of supplementary controller parameters of a unified powerflow controller(UPFC) for damping low-frequency oscillations in a weakly connected systemis investigated. The individual design of the UPFC controller, using hybrid particle swarmoptimization and gravitational search algorithm (PSOGSA)technique under 3 loadingoperating conditions, is discussed. The effect...

The ageing of materials is an irreversible, in-time occurring complex phenomenon, which affects both wood surfaces and the coating materials. This paper focuses on light-induced natural wood-coated in indoor conditions. Two species: European maple (Acer pseudoplatanus) walnut (Juglans regia) two types waxes: bees wax Chinese were employed experiments presented this paper. Uncoated coated sample...

There is a strong need to extend whole-tree measurements of sap flow into broad-leaved forests where characteristics of stand structure, surface roughness, leaf dimension, and aerodynamic and canopy conductance may interact to partially decouple the canopy from the atmosphere. The implications partial decoupling to understanding the environmental control of canopy transpiration and to the model...

enzymatic browning and formation of brown pigments are some of the most important problems in preparation of mushroom purees. in this study, the effect of some anti browning agents including sodium metabisulphite, ascorbic acid, and citric acid on the whiteness and foaming properties of mushroom purees was investigated. the results showed that soaking with acids and sodium metabisulphite signif...